New testcase for LICM reassociation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2560 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/Reassociate/looptest.ll b/test/Transforms/Reassociate/looptest.ll
new file mode 100644 (file)
index 0000000..af516c6
--- /dev/null
+++ b/test/Transforms/Reassociate/looptest.ll
@@ -0,0 +1,59 @@
+; This testcase comes from this C fragment:
+;
+; void test(unsigned Num, int *Array) {
+;  unsigned i, j, k;
+;
+;  for (i = 0; i != Num; ++i)
+;    for (j = 0; j != Num; ++j)
+;      for (k = 0; k != Num; ++k)
+;        printf("%d\n", i+k+j);    /* Reassociate to (i+j)+k */
+;}
+;
+; In this case, we want to reassociate the specified expr so that i+j can be
+; hoisted out of the inner most loop.
+;
+; RUN: if as < %s | opt -reassociate | dis | grep 115 | grep 117
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+
+%.LC0 = internal global [4 x sbyte] c"%d\0A\00"                ; <[4 x sbyte]*> [#uses=1]
+
+declare int "printf"(sbyte*, ...)
+
+void "test"(uint %Num, int* %Array) {
+bb0:                                   ;[#uses=1]
+       %cond221 = seteq uint 0, %Num           ; <bool> [#uses=3]
+       br bool %cond221, label %bb7, label %bb2
+
+bb2:                                   ;[#uses=3]
+       %reg115 = phi uint [ %reg120, %bb6 ], [ 0, %bb0 ]               ; <uint> [#uses=2]
+       br bool %cond221, label %bb6, label %bb3
+
+bb3:                                   ;[#uses=3]
+       %reg116 = phi uint [ %reg119, %bb5 ], [ 0, %bb2 ]               ; <uint> [#uses=2]
+       br bool %cond221, label %bb5, label %bb4
+
+bb4:                                   ;[#uses=3]
+       %reg117 = phi uint [ %reg118, %bb4 ], [ 0, %bb3 ]               ; <uint> [#uses=2]
+       %reg113 = add uint %reg115, %reg117             ; <uint> [#uses=1]
+       %reg114 = add uint %reg113, %reg116             ; <uint> [#uses=1]
+       %cast227 = getelementptr [4 x sbyte]* %.LC0, uint 0, uint 0             ; <sbyte*> [#uses=1]
+       call int (sbyte*, ...)* %printf( sbyte* %cast227, uint %reg114 )                ; <int>:0 [#uses=0]
+       %reg118 = add uint %reg117, 1           ; <uint> [#uses=2]
+       %cond224 = setne uint %reg118, %Num             ; <bool> [#uses=1]
+       br bool %cond224, label %bb4, label %bb5
+
+bb5:                                   ;[#uses=3]
+       %reg119 = add uint %reg116, 1           ; <uint> [#uses=2]
+       %cond225 = setne uint %reg119, %Num             ; <bool> [#uses=1]
+       br bool %cond225, label %bb3, label %bb6
+
+bb6:                                   ;[#uses=3]
+       %reg120 = add uint %reg115, 1           ; <uint> [#uses=2]
+       %cond226 = setne uint %reg120, %Num             ; <bool> [#uses=1]
+       br bool %cond226, label %bb2, label %bb7
+
+bb7:                                   ;[#uses=2]
+       ret void
+}